JP2001052852A - High-frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a concentration domain of microwave in a heating chamber by controlling the distribution of standing wave in the heating chamber and to allow a user to check the concentration domain by a display means. SOLUTION: This high-frequency heating device is equipped with a heating chamber 10 for housing an object to be heated, a high-frequency wave generating means 11, a groove part 6 with one end on an opening part 14 provided in a heating-chamber wall surface 15, an impedance varying means 17 provided in the groove part 6 for varying the impedance of the opening part 14, a drive means 18 for rotatingly driving the impedance varying means 17, and a spot light 20. The impedance varying means 17 changes the flow of high-frequency current through the opening part 14 to change the distribution of standing wave in the heating chamber 10, and the spot light 20 illuminates a place where microwave is concentrated, thereby allowing a user to check a heating zone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device for heating an object to be heated.

[0002]

2. Description of the Related Art A high-frequency heating apparatus supplies microwaves generated from a magnetron, which is high-frequency generating means, to a heating chamber for accommodating an object to be heated, and heats the object to be heated by the supplied microwave. And microwave heating has a different temperature rise state depending on the dielectric properties of the object to be heated,
2. Description of the Related Art In order to prevent uneven heating of an object to be heated, a method of stirring microwaves in a heating chamber or a method of rotating an object to be heated by using a turntable have been adopted in a conventional high frequency heating apparatus. Furthermore, in recent years, from the viewpoint of energy saving, there is a method of controlling the rotation of a turntable, for example, heating the object to be heated while stopping the turntable at regular intervals, in order to quickly heat the object to be heated.

[0003] On the other hand, Japanese Patent Application Laid-Open No. 9-27389 discloses that a distribution variable means for changing an electromagnetic field distribution in a heating chamber is provided, and the distribution variable means is controlled based on temperature distribution information of an object to be heated. . This distribution variable means is configured to move the radiation position of the microwave to the heating chamber, moves the radiation position of the microwave to a low-temperature region in the temperature distribution of the object to be heated, and locally heats the low-temperature region. Thus, the whole object to be heated is heated to a uniform temperature.

[0004]

However, the method of stirring the microwaves or rotating the turntable is based on the basic idea of uniformly heating the object to be heated, so that the object to be heated having different dielectric characteristics is used. When heated,
Since the temperature of the object to be heated varies depending on the dielectric properties, it has been difficult to uniformly increase the temperature of the object to be heated.

In the method of heating while stopping the turntable at regular intervals, the effect cannot be obtained unless the object to be heated is placed at a predetermined position in the heating chamber. I do not know whether to put it. In addition, since the place where the microwaves are concentrated cannot be changed, there is a problem that the position of the object to be heated must be changed each time the heating part is changed. In addition, the heated portion cannot be specified without stopping the rotation of the turntable, but it is very difficult for the user to stop the rotation of the turntable.

Furthermore, if a conventional distribution changing means for changing the electromagnetic field distribution in the heating chamber is used, the microwave radiation position can be moved to the heating area in the heating chamber designated by the user. It is difficult to reliably heat the region specified by the user to the inside by microwaves due to radiation because of the influence of the dielectric properties of the object placed on the substrate. For example, when cooking curry or the like, there is a practical problem that microwaves generated by radiation heat only the periphery of the curry.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and means for forming a concentrated space area of a microwave in a heating chamber by acting on a standing wave in the heating chamber and enabling a user to confirm the concentrated area. It is an object of the present invention to provide a high-frequency heating device provided with:

[0008]

In order to solve the above-mentioned problems, a high-frequency heating apparatus according to the present invention comprises a heating chamber for accommodating an object to be heated, and a high-frequency generating means for generating a microwave for supplying power to the heating chamber. An opening provided to cut off the flow of a high-frequency current generated on the metal wall surface of the heating chamber, an impedance variable means for changing the impedance of the opening, and a display means for indicating a heating area of the heating chamber. It is provided.

The distribution of the standing wave in the heating chamber is changed by changing the flow of the high-frequency current on the wall surface of the heating chamber by means of the impedance variable means, thereby defining the concentrated space area of the microwave in the heating chamber and the defined area. Is displayed by the display means as a heating area.

[0010] This makes it possible to easily inform the user of the optimal placement position in the heating chamber of the object to be heated strongly when heating the object to be heated having different dielectric characteristics.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating apparatus according to the present invention has a heating chamber for accommodating an object to be heated, a high-frequency generating means for generating microwaves for supplying power to the heating chamber, and An opening provided to divide the flow of a high-frequency current generated on the metal wall surface of the chamber; impedance variable means for changing the impedance of the opening; and display means for indicating a heating area of the heating chamber. is there.

Then, the flow of the high-frequency current on the wall surface of the heating chamber is changed by the impedance variable means to change the standing wave distribution of the heating chamber, thereby defining the concentrated space area of the microwave in the heating chamber and the defined area. Is displayed by the display means as a heating area. This allows
It is possible to easily inform the user of the optimal placement position of the portion of the object to be heated in the heating chamber, and to surely heat the heated portion to the inside of the food.

The high-frequency heating apparatus according to the present invention is characterized in that
As described, a heating chamber that stores the object to be heated, and a high-frequency generation unit that generates a microwave to supply power to the heating chamber,
An opening provided to divide the flow of a high-frequency current generated on the metal wall surface of the heating chamber; impedance variable means for changing the impedance of the opening; display means for indicating a heating area of the heating chamber; And a control means for controlling the impedance varying means and the display means based on information.

The standing wave distribution in the heating chamber is changed to an optimum state for heating the object to be heated by controlling the impedance variable means based on the heating information, and the concentration of microwaves in the heating chamber formed by the distribution is changed. The area is displayed by the display means as a heating area. Thereby, even during the heating of the object to be heated, the strongly heated region of the object to be heated can be confirmed, and the user can determine the heating progress state of the object to be heated.

The high-frequency heating apparatus according to the present invention is characterized in that:
As described, the impedance variable unit is configured to be driven to rotate, and an angle determination unit that determines a rotation angle of the impedance variable unit is added.The control unit controls the display unit based on the rotation angle of the impedance variable unit. To control.

The microwave concentration area in the heating chamber is made to correspond to the rotation angle of the impedance varying means, and the heating area corresponding to the rotation angle is displayed by the display means. As a result, it is possible to determine where the object to be heated is being heated, and it is possible to easily confirm that the entire object to be heated is being heated or that a specific part is being intensively heated. Can be enhanced.

The high-frequency heating device according to the present invention is characterized in that:
As described, the display means is a light emitting means for illuminating a heating area of the heating chamber.

The heating area of the heating chamber is illuminated by the light emitting means. Thereby, even during heating after the object to be heated is mounted, the object to be heated can be illuminated to inform the progress of the heating.

The high-frequency heating device according to the present invention is characterized in that:
As described above, the display means is a temperature-sensitive material for discoloring and displaying the heating area of the heating chamber.

The heating area on the bottom of the heating chamber is discolored and displayed by the temperature-sensitive material. Thereby, the user can be notified of the actual heating area.

The high-frequency heating apparatus according to the present invention is characterized in that:
As described above, the display means is a display element that displays a heating area of the heating chamber on a screen.

The display device displays the heating area of the heating chamber on a screen. Thereby, it is possible to determine from the outside of the main body without the trouble of opening the heating area of the high-frequency heating device.

The high-frequency heating device according to the present invention is characterized by claim 7.
As described above, the heating information to the control means is heating information selectively input as a heating area of the heating chamber.

[0024] By selecting and inputting the microwave concentrated area, that is, the heating area, the user can recognize the place where the object to be heated is placed in the heating chamber, and at the time of heating the object to be heated. The microwave can be concentrated on the object to be heated, and the object to be heated can be heated in a shorter time.

The high-frequency heating apparatus according to the present invention is characterized in claim 8.
As described above, the heating information to the control means is heating information selectively input as a type of the object to be heated.

Then, by selectively inputting the type of the object to be heated, the impedance varying means is controlled according to the type of the object to be heated, and the standing wave distribution of the heating chamber is determined. Thereby, various objects to be heated can be heated with an optimum standing wave distribution according to their dielectric properties. Also,
For example, objects to be heated having different dielectric properties can be heated simultaneously.

The high-frequency heating apparatus according to the present invention is characterized in that
As described above, the heating information to the control means is heating information selectively input as a heating method of the object to be heated.

Then, by selectively inputting the heating method of the object to be heated, the impedance varying means is controlled in accordance with the heating method of the object to be heated to change the standing wave distribution of the heating chamber. Thus, the object to be heated can be heated with a standing wave distribution according to each heating method such as thawing, warming, and reheating.

The high-frequency heating apparatus according to the present invention is characterized in that:
0, the control means controls the impedance variable means based on information on the heating area of the display means.

The impedance varying means is controlled based on the information on the heating area specified by the display means to change the standing wave distribution in the heating chamber. As a result, the degree of freedom in specifying the heating area is increased, so that it is possible to easily specify the distribution of the area to be heated in the mixed food such as a lunch box. Further, by setting the heating area according to the heating progress state, heating can be performed with a standing wave distribution suitable for the state of the object to be heated.

[0031]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a schematic configuration diagram of a high-frequency heating device showing a first embodiment of the present invention, and FIG. 2 is a diagram showing an appearance of the high-frequency heating device.

1 and 2, reference numeral 10 denotes a heating chamber for storing an object to be heated, and the wall surface of the heating chamber 10 is made of metal. Numeral 11 denotes a magnetron (high-frequency generating means) for generating a microwave, 12 denotes a waveguide for transmitting the microwave from the magnetron 11 to the heating chamber 10, and 13 radiates the microwave from the waveguide 12 to the heating chamber 10. Power supply port.
Reference numeral 14 denotes an opening provided on the wall surface 15 of the heating chamber 10, and reference numeral 16 denotes a groove formed of metal having the opening 14 as one end. Numeral 17 denotes an impedance varying means for varying the impedance of the opening 14 and is constituted by a dielectric plate 17a. The dielectric plate 17a is preferably made of a low dielectric loss material having a relative dielectric constant of 5 or more (for example, glass, ceramic, or resin), and has projections at both ends thereof. And is supported by rotation. Reference numeral 18 denotes a motor (dielectric plate rotation driving means) for driving the dielectric plate 17a. Detecting means 1 for detecting the rotation angle and rotation speed of the dielectric plate 17a
9 are provided. Reference numeral 20 denotes a spotlight (display means) for irradiating the microwave concentration area of the heating chamber 10, that is, the heating area, and reference numeral 21 denotes a motor for changing the irradiation angle of the spotlight 20. Reference numeral 22 denotes control means for controlling the magnetron 11, the motor 18, and the motor 21.
Reference numeral 23 denotes an operation unit for inputting heating information to the control means at the time of heating, and reference numeral 24 denotes a display element for displaying a heating area of the heating chamber on its screen.

Next, the operation of the above configuration will be described.
The groove depth, the groove height, and the arrangement position of the dielectric plate of the groove portion 16 are determined when the dielectric plate 17a is perpendicular to the bottom surface of the heating chamber 10 (the rotation angle at this time is 0 °). , Aperture 14
Is determined to have an extremely small value (ideally, zero). On the other hand, the dielectric plate 17a
Is horizontal to the bottom of the heating chamber 10 (the rotation angle at this time is 9
0 °. ), The impedance generated in the opening 14 is an extremely large value (ideally infinite). In FIG. 1, the rotation angle of the dielectric plate 17a is 0 °.

The control unit 22 controls the magnetron 11 and the motor 18 based on the heating information from the operation unit 23 and the like and the information such as the rotation angle and the rotation speed of the dielectric plate 17a from the detection unit 19. As a method of driving the dielectric plate 17a, the dielectric plate 17a may be rotated stepwise at a certain angle or continuously.

The control means 22 changes the rotation angle of the dielectric plate 17a based on the heating information of the object to be heated, and simultaneously turns on the spotlight 20 to operate the motor 21. The spotlight 20 irradiates a place where microwaves are concentrated based on the rotation angle of the dielectric plate 17a.

When heating a specific area of the object to be heated, the object to be heated is placed in the heating chamber with the position irradiated by the spotlight 20 irradiating the specific area of the object to be heated.
Thereafter, the control means 22 operates the magnetron 11 based on the heating start information of the operation unit 23, and
And heats the microwaves supplied to the heating chamber in a specific region of the object to be heated. Thereby, the specific region of the object to be heated can be reliably heated.

The operation section 23 and the display element 24 indicating the heating area are provided outside the main body of the high-frequency heating apparatus so that the heating area can be distinguished from the outside of the high-frequency heating apparatus simultaneously with the spotlight. FIG. 2 shows a case where the left side of the heating chamber is fixed as a heating area.

FIG. 3 is a diagram showing the relationship between the rotation angle of the dielectric plate 17a and the high-temperature portion of the object to be heated when 200 g of the ad hair paste is heated as the object to be heated. FIGS. 3A to 3C show rotation angles of 0 °, 45 °, and 90 °, respectively, and indicate that the lighter the color, the higher the temperature. By changing the rotation angle of the dielectric plate 17a, the positions of the high temperature part and the low temperature part change. Therefore, the standing wave distribution can be changed by the rotation angle of the dielectric plate 17a. For example, when the rotation angle of the dielectric plate 17a is 0 °, the left side of the heating chamber is heated, and when the rotation angle is 90 °, the right side of the heating chamber is heated. Therefore, when the rotation angle of the dielectric plate 17a is 0 °, the spotlight 20 illuminates the left part of the heating chamber, and when the rotation angle is 90 °, the spotlight 20 illuminates the right part of the heating chamber.

Further, the heating of the object to be heated by such a standing wave distribution can promote the heating of the inside of the object to be heated having a large thickness.

Next, a case where the heating zone is not fixed, that is, a case where the whole object to be heated is uniformly heated will be described. This heating is performed by pressing the uniform key. The uniform key is used to control information for continuously rotating the dielectric plate 17a.
Send to 2. At this time, the spotlight 20 may irradiate the entire heating chamber 10 without moving while irradiating the entire heating chamber 10 in conjunction with the rotation of the dielectric plate 17a.

Depending on the object to be heated, the rotation angle of the dielectric plate 17a may be variably controlled during heating. In this case, the irradiation position of the spotlight 20 is changed in conjunction with the change in the rotation of the dielectric plate 17a during heating, and it is possible to determine which part of the object to be heated is being heated.

By providing the display means as described above, the heating area of the heating chamber can be indicated, so that the user can determine the heating progress state of the object to be heated.

Next, the operation based on the heating information from the operation unit 23 will be described.

A case where the heating area in the heating chamber is input as heating information by the operation unit 23 will be described. If the dielectric properties of the object to be heated are particularly different, for example, food such as curry and rice is easy to generate heat, but food with a high salt content such as curry is difficult to be heated to the inside, so the cooked rice is sufficiently warmed. Curry may be underheated. Therefore, it is necessary to concentrate microwaves on food that is not easily heated by microwaves. The heating area is illuminated by the spotlight 20 by previously selecting and inputting the heating area from the operation unit 23 before heating. The user places the curry in the illuminated area. After that, by inputting the heating start information, the rotation angle of the dielectric plate 17a is changed,
Heating is performed by concentrating microwaves in the illuminated area. FIG. 4 shows the case where the curry and the cooked rice are heated at the same time, FIG. 4 (a) shows the case where the heating area is selected and inputted so as to concentrate the microwave on the right side of the heating chamber 10, and FIG. It is the result of measuring the temperature of curry and cooked rice when heated without selecting input. The higher the height of the graph, the higher the temperature range, and the greater the shaded area, the more appropriate the temperature. When heating without selecting the heating zone, the cooked rice is overheated but the curry temperature has not risen. On the other hand, curry could be heated to an appropriate temperature by selecting and heating the heating area.

As described above, by selectively inputting the heating area, foods having different dielectric properties can be heated simultaneously.

Next, a case where the type of the object to be heated is input as heating information will be described. When warming foods such as milk and alcohol, it is necessary to irradiate the entire container with microwaves in order to warm it up and down without a temperature difference. Therefore, control is performed to increase the rotation speed of the dielectric plate 17a in order to disperse the microwave.

When the heating information of the drink is input from the operation unit 23 to the control means 22, the control means 22 heats the object to be heated by increasing the rotation speed of the motor 18. When 200 g of milk was heated as an object to be heated, the vertical temperature difference was 12 ° C. when the rotation speed was 15 rpm, but the vertical temperature difference was 10 ° C. when the rotation speed was 100 rpm.

As described above, by making the type of the object to be heated correspond to the control method of the impedance variable means, an optimum standing wave distribution corresponding to the type of the object to be heated is formed in the heating chamber, and The object can be optimally heated.

The case where the heating method of the object to be heated is input as heating information will be described. Heating information such as reheating, thawing or warming is input from the operation unit 23 to the control unit 22. The control unit 22 changes the rotation angle and rotation speed of the impedance variable unit, the control pattern of the microwave intensity, and the like based on such heating information from the operation unit 23. For example, in the thawing of frozen food, the rotation angle of the dielectric plate 17a is constantly changed so that the microwave can be radiated to the whole after selecting the standing wave distribution in which the center can be heated and concentrating the microwave at the center. Control.

As an example of a specific control method, FIG. 5 shows a control pattern of a rotation angle and a microwave intensity when 300 g of frozen minced beef is thawed. 0 ° and 90 ° indicate that the dielectric plate 17a is stopped and heated at 0 ° and 90 °, respectively. If thawing is performed without changing the rotation angle or the control pattern of the microwave intensity, the part that changes color due to overheating and the part that has not been thawed will coexist, but thawing without controlling overheating by controlling the rotation angle and microwave intensity. We were able to.

By inputting the heating method as described above, the object to be heated can be heated with the optimum standing wave distribution and microwave intensity.

In this embodiment, the spotlight 20 is used as the display means for indicating the heating area, and the spotlight 20 itself is moved to irradiate the place where the microwaves are concentrated. A method of changing the irradiation position by changing the angle of the reflector may be used. The spotlight 20 may be provided on the bottom surface.

Although not shown, the heating information may include a signal from a steam sensor in the heating chamber or the rotation angle of the dielectric plate 17a.

(Embodiment 2) Next, a second embodiment of the present invention will be described.

FIG. 6 is a schematic configuration diagram of a high-frequency heating apparatus according to a second embodiment of the present invention. The difference between the second embodiment of the present invention and the first embodiment will be described.

In FIG. 6, reference numeral 25 denotes a sheet-like microwave absorbing and heating element, which is affixed to the bottom of the heating chamber 10.
A sheet-like temperature-sensitive material 26 is similarly affixed on the microwave-absorbing heating element 25, and the temperature-sensitive material 26 changes color when it reaches a certain temperature or higher. In a place where microwaves are concentrated, the microwave absorbing and heating element 25 generates heat, and the heat discolors the temperature-sensitive material 26, so that the place where the microwaves are concentrated on the bottom surface of the heating chamber 10 can be determined.

When the heating area is selectively inputted from the operating section 23 to the control means 22, the control means 22 changes the rotation angle of the dielectric plate 17a, and then emits a weak microwave to the heating chamber 10 to generate microwave absorption heat. The body 25 is heated in advance to change the color of the temperature-sensitive material 26. At this time, the microwave
These series of operations are performed with the door closed so that they cannot escape from zero. When heating an object to be heated, a door is opened and a portion to be heated of the object to be heated is placed on the discolored area of the temperature-sensitive material and heated.

For foods such as commercially available delicatessen in which the edible temperature zone is a mixture of high and low temperatures, it is necessary to accurately determine the heating zone and heat the food.

As described above, by attaching the microwave absorbing heating element and the temperature-sensitive material to the bottom surface of the heating chamber, the heating area on the bottom surface can be accurately determined.

The microwave-absorbing heating element 25 is made of a material that does not absorb microwaves enough to hinder heating of the object to be heated.

Further, the discoloration temperature of the temperature-sensitive material 26 is desirably set to a lower temperature because if the temperature is too high, the influence on the object to be heated becomes large.

(Embodiment 3) Next, a third embodiment of the present invention will be described.

FIG. 7 is an external view of a high-frequency heating device according to a third embodiment of the present invention. The point that the third embodiment of the present invention is different from the first embodiment will be described. In FIG. 7, the display element 2
Reference numeral 4 denotes a configuration in which the control unit 22 transmits information on the range of the heating area displayed on the display screen. Reference numeral 27 denotes an operation unit for designating and inputting a heating area on the display element 24.

When the object to be heated is to be heated, the user inputs the heating area information on which part of the heating chamber 10 is to be heated from the operating section 27 while looking at the display contents of the display element 24. For example, the display element 24 shown in FIG. 7 shows a case where the left side is strong. However, when it is desired to move the portion to be heated of the object to be heated slightly to the right side, the colored portion of the display element 24 is slightly shifted to the right by the arrow of the operation unit 27. Move. The control means 22 changes the rotation angle of the dielectric plate 17a corresponding to the heating area designated by the display element 24, and changes the heating area.

On the other hand, when it is desired to increase the area of the region to be heated, the area of the colored portion of the display element 24 is increased by the arrow of the operation unit 27 so as to increase the heating area of the display element 24. In this operation example, the heating area is expanded by pressing the right arrow while pressing the left arrow. The control unit 22 selects two angles as the rotation angle of the dielectric plate 17a in order to heat a wide heating area of the display element 24. The driving of the dielectric plate 17a is controlled so as to reciprocate between the two selected rotation angles, thereby heating a wide heating area.

Further, the shape, size, and partition of the container are different from each other as in the case of a commercially available bento, and the object to be heated composed of various kinds of foods has different regions to be heated. There is a need to. A plurality of dispersed heating areas are designated in the display element 24 for such heating of the foodstuff. The control means 22 stores the rotation angles of the impedance variable means corresponding to the individual heating zones that can be designated. Therefore, for heating the object to be heated in which the heating area is dispersed, the control means 22 controls the impedance variable means to rotate the impedance variable means so as to temporarily stop the rotation at a specified rotation angle to heat the object to be heated. .

As described above, by selecting a heating area using the operation unit 27 while looking at the display element 24, a complicated heating area can be designated, and desired heating can be performed even with mixed foods.

The colored portion of the display element 24 may be displayed by light emission in order to make it easier for the user to identify the heating area. Further, a display element of a touch panel may be used. Further, by additionally designating the heating area during the heating of the object to be heated, the heating according to the heating state of the object to be heated can be executed.

In the above embodiment, the long axis direction of the opening portion 14 is parallel to the depth direction. However, the opening portion 14 may be disposed in any direction as long as it disturbs the flow of the high-frequency current. I do not care.

Further, in the figure of the present embodiment, the left, center, right and uniform keys for selecting a heating area are used in the operation section, but replaced with keys for inputting a heating method such as reheating and thawing. Or they may be arranged in combination.

[0072]

As described above, according to the present invention, the following effects can be obtained.

According to the high-frequency heating apparatus of the first aspect of the present invention, the flow of the high-frequency current on the wall surface of the heating chamber is changed by the impedance variable means to change the standing wave distribution in the heating chamber, and the micro-wave in the heating chamber is changed. The configuration in which the wave concentration area is spatially defined and the wave concentration area is displayed by the display means makes it easy for the user to know the optimal placement position of the part to be heated in the heating chamber of the part to be heated, and also displays the heating part. Can be reliably heated to the inside of the food.

According to the high-frequency heating device of the second aspect of the present invention, by controlling the impedance variable means based on the heating information, the standing wave distribution in the heating chamber is optimized for heating the object to be heated. By changing the state and displaying the concentrated region of the microwave in the heating chamber formed by the display means, it is possible to confirm the strongly heated region of the heated object even during the heating of the heated object. Can determine the heating state of the object to be heated.

According to the high-frequency heating device of the third aspect of the present invention, the concentration region of the microwaves in the heating chamber is made to correspond to the rotation angle of the impedance varying means, and the heating region corresponding to the rotation angle is displayed. By doing so, it is possible to determine where the heated object is being heated, and easily check the heating state such as the state where the entire heated object is heated or the state where a specific part is intensively heated. And convenience can be improved.

According to the high frequency heating apparatus of the fourth aspect of the present invention, the display means is a light emitting means for illuminating the heating area of the heating chamber, so that the heating progress state can be maintained even during the heating of the object to be heated. I can let you know.

According to the high-frequency heating device of the fifth aspect of the present invention, the display means is made of a temperature-sensitive material for discoloring and displaying the heating area of the heating chamber, thereby notifying the user of the actual heating area. Can be.

Further, according to the high frequency heating apparatus of the present invention, the display means is a display element for displaying the heating area of the heating chamber, so that there is no need to open the heating area of the heating chamber. can do.

Further, according to the high frequency heating apparatus of the present invention, the heating information to the control means is the heating information selectively input as the heating area of the heating chamber, so that the user can use the heating information. The place where the object to be heated is placed in the heating chamber can be recognized, and in heating the object to be heated, microwaves can be concentrated on the object to be heated, and the object to be heated can be heated in a shorter time.

Further, according to the high frequency heating apparatus of the eighth aspect of the present invention, the heating information to the control means is the heating information which is selectively inputted as the type of the object to be heated. By controlling the impedance variable means according to the type, it is possible to heat various objects to be heated with an optimum standing wave distribution according to their dielectric properties.

Further, according to the high frequency heating apparatus of the ninth aspect of the present invention, the heating information to the control means is the heating information which is selectively inputted as the heating method of the object to be heated. The object to be heated can be heated with a standing wave distribution according to each of the heating methods of thawing, warming, and reheating by controlling the impedance variable means according to the heating method.

According to the high-frequency heating apparatus of the tenth aspect of the present invention, the control means controls the impedance variable means based on the information on the heating area of the display means, so that the degree of freedom in specifying the heating area is increased. Because of this, it is possible to easily specify the distribution of the heating area for mixed foods such as a lunch box. Further, the heating area can be set according to the heating progress state, and heating can be performed with a standing wave distribution suitable for the state of the object to be heated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the appearance of the high-frequency heating device according to the first embodiment of the present invention.

FIG. 3 (a) is a diagram showing a heating range of the object to be heated when the rotation angle of the dielectric plate is 0 °. FIG. 3 (b) is a diagram showing a heating range of the object to be heated when the rotation angle of the dielectric plate is 45 °. (C) Diagram showing the heating area of the object to be heated when the rotation angle of the dielectric plate is 90 °

FIG. 4 (a) A diagram showing the temperature when curry and cooked rice are heated simultaneously by selecting and inputting a heating region. (B) A diagram showing the temperature when curry and cooked rice are heated simultaneously without selecting and inputting a heating region.

FIG. 5: 300 g of frozen minced beef of the first embodiment of the present invention.
Diagram showing thawing control pattern of

FIG. 6 is a diagram showing a schematic configuration of a high-frequency heating device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing the appearance of a high-frequency heating device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating chamber 11 Magnetron (high frequency generation means) 12 Waveguide 14 Opening part 17 Impedance variable means 17a Dielectric plate 18 Motor (Dielectric plate rotation drive means) 19 Detecting means (Angle determining means) 20 Spotlight (Display means) 22 control means 23 operation part 24 display element (display means) 25 microwave absorption heating element 26 temperature sensitive material (display means) 27 heating area designation input operation part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 6/68 310 H05B 6/68 310Z 6/70 6/70 C (72) Inventor Akihiko Nakajima Kadoma, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Koji Yoshino 1006 Ojimon Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. In-house F term (reference) 3K086 AA01 AA03 BA08 BB05 BB08 CA02 CB03 CB05 CB12 CC01 CC13 CD11 CD23 CD27 FA03 FA10 3K090 AA01 AA02 AB02 AB03 BA01 BB01 BB16 CA02 CA21 DA15 DA18 EB10 EB36 3L086 AA01 CC03 CB08 CC08 CC14 DA24 DA29

Claims (10)

[Claims] 1. A heating chamber for storing an object to be heated, a high-frequency generating means for generating a microwave for supplying power to the heating chamber,
An opening provided to divide the flow of the high-frequency current generated on the metal wall surface of the heating chamber; impedance variable means for changing the impedance of the opening; and display means for indicating a heating area of the heating chamber. High frequency heating device. 2. A heating chamber for accommodating an object to be heated, a high-frequency generating means for generating a microwave for supplying power to the heating chamber,
An opening provided to divide the flow of a high-frequency current generated on the metal wall surface of the heating chamber; impedance variable means for changing the impedance of the opening; display means for indicating a heating area of the heating chamber; A high-frequency heating device including a control unit that controls the impedance variable unit and the display unit based on information. 3. The variable impedance means is configured to be driven to rotate, and an angle determining means for determining a rotation angle of the variable impedance means is added. The control means controls the display means based on the rotation angle of the variable impedance means. 3. The high-frequency heating device according to claim 2, wherein 4. The high frequency heating apparatus according to claim 1, wherein the display means is a light emitting means for illuminating a heating area of the heating chamber. 5. The high-frequency heating apparatus according to claim 1, wherein the display means is a temperature-sensitive material for discoloring and displaying the heating area of the heating chamber. 6. The high-frequency heating apparatus according to claim 1, wherein the display means is a display element for displaying a heating area of the heating chamber on a screen. 7. The high-frequency heating apparatus according to claim 2, wherein the heating information to the control means is heating information selectively input as a heating area of the heating chamber. 8. The high-frequency heating apparatus according to claim 2, wherein the heating information to the control means is heating information selectively input as a type of the object to be heated. 9. The high-frequency heating apparatus according to claim 2, wherein the heating information to the control means is heating information selected and input as a heating method of the object to be heated. 10. The high-frequency heating apparatus according to claim 2, wherein the control means controls the impedance variable means based on information on a heating area of the display means.